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ICSE Class 10 Physics 2015 Paper

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A block and tackle system has V.R. =5=5.
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Question : 38 of 74
Marks: +1, -0
Rohan exerts a pull of 150 Kgf150\,\mathrm{Kgf} . What is the maximum load he can raise with this pulley system if its efficiency =75%=75\% ?
Solution:  
Given : V.R. =5=5, Effort =150 kgf=150\,\mathrm{kgf}, Efficiency =75%=75\%
  Efficiency  =    M.A.    V.R.  ×100\;\text{Efficiency}\;=\;\frac{\;\text{M.A.}\;}{\;\text{V.R.}\;}\times 100
75  =    M.A.  5×10075\;=\;\frac{\;\text{M.A.}\;}{5}\times 100
  M.A.    =  75×5100=3.75\;\text{M.A.}\;\;=\;\frac{75\times5}{100}=3.75
  But      M.A.    =    Load    Effort  \;\text{But}\;\; \;\text{M.A.}\;\;=\;\frac{\;\text{Load}\;}{\;\text{Effort}\;}
3.75  =    Load  150 kgf3.75\;=\;\frac{\;\text{Load}\;}{150\,\mathrm{kgf}}
  Load    =3.75×150\;\text{Load}\;\;=3.75\times 150
  =562.5 kgf.\;=562.5\,\mathrm{kgf} .
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